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  <h2>Ebiten example - keyboard</h2>
  <iframe src="keyboard.content.html" width="640" height="480"></iframe>
  <div class="card"><pre class="card-body"><code class="language-go">// &#43;build example

package main

import (
        _ &#34;image/png&#34;
        &#34;log&#34;
        &#34;strconv&#34;

        &#34;github.com/hajimehoshi/ebiten&#34;
        &#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
        &#34;github.com/hajimehoshi/ebiten/examples/keyboard/keyboard&#34;
)

const (
        screenWidth  = 320
        screenHeight = 240
)

var keyboardImage *ebiten.Image

func init() {
        var err error
        keyboardImage, _, err = ebitenutil.NewImageFromFile(&#34;_resources/images/keyboard/keyboard.png&#34;, ebiten.FilterDefault)
        if err != nil {
                log.Fatal(err)
        }
}

var keyNames = map[ebiten.Key]string{
        ebiten.KeyBackspace:    &#34;BS&#34;,
        ebiten.KeyComma:        &#34;,&#34;,
        ebiten.KeyEnter:        &#34;Enter&#34;,
        ebiten.KeyEscape:       &#34;Esc&#34;,
        ebiten.KeyPeriod:       &#34;.&#34;,
        ebiten.KeySpace:        &#34;Space&#34;,
        ebiten.KeyTab:          &#34;Tab&#34;,
        ebiten.KeyMinus:        &#34;-&#34;,
        ebiten.KeyEqual:        &#34;=&#34;,
        ebiten.KeyBackslash:    &#34;\\&#34;,
        ebiten.KeyGraveAccent:  &#34;`&#34;,
        ebiten.KeyLeftBracket:  &#34;[&#34;,
        ebiten.KeyRightBracket: &#34;]&#34;,
        ebiten.KeySemicolon:    &#34;;&#34;,
        ebiten.KeyApostrophe:   &#34;&#39;&#34;,
        ebiten.KeySlash:        &#34;/&#34;,

        // Arrows
        ebiten.KeyDown:  &#34;Down&#34;,
        ebiten.KeyLeft:  &#34;Left&#34;,
        ebiten.KeyRight: &#34;Right&#34;,
        ebiten.KeyUp:    &#34;Up&#34;,

        // Mods
        ebiten.KeyShift:   &#34;Shift&#34;,
        ebiten.KeyControl: &#34;Ctrl&#34;,
        ebiten.KeyAlt:     &#34;Alt&#34;,
}

func update(screen *ebiten.Image) error {
        // Collect pressed keys&#39; names.
        pressed := []string{}
        for i := 0; i &lt;= 9; i&#43;&#43; {
                if ebiten.IsKeyPressed(ebiten.Key(i) &#43; ebiten.Key0) {
                        pressed = append(pressed, string(i&#43;&#39;0&#39;))
                }
        }
        for c := &#39;A&#39;; c &lt;= &#39;Z&#39;; c&#43;&#43; {
                if ebiten.IsKeyPressed(ebiten.KeyA &#43; ebiten.Key(c-&#39;A&#39;)) {
                        pressed = append(pressed, string(c))
                }
        }
        for i := 1; i &lt;= 12; i&#43;&#43; {
                if ebiten.IsKeyPressed(ebiten.KeyF1 &#43; ebiten.Key(i-1)) {
                        pressed = append(pressed, &#34;F&#34;&#43;strconv.Itoa(i))
                }
        }
        for key, name := range keyNames {
                if ebiten.IsKeyPressed(key) {
                        pressed = append(pressed, name)
                }
        }

        if ebiten.IsRunningSlowly() {
                return nil
        }

        const (
                offsetX = 24
                offsetY = 40
        )

        // Draw the base (grayed) keyboard image.
        op := &amp;ebiten.DrawImageOptions{}
        op.GeoM.Translate(offsetX, offsetY)
        op.ColorM.Scale(0.5, 0.5, 0.5, 1)
        screen.DrawImage(keyboardImage, op)

        // Draw the highlighted keys.
        op = &amp;ebiten.DrawImageOptions{}
        for _, p := range pressed {
                op.GeoM.Reset()
                r, ok := keyboard.KeyRect(p)
                if !ok {
                        continue
                }
                op.GeoM.Translate(float64(r.Min.X), float64(r.Min.Y))
                op.GeoM.Translate(offsetX, offsetY)
                op.SourceRect = &amp;r
                screen.DrawImage(keyboardImage, op)
        }

        return nil
}

func main() {
        if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Keyboard (Ebiten Demo)&#34;); err != nil {
                log.Fatal(err)
        }
}
</code></pre></div>

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